C-Map dynamic current graphic
When the Tides layer is enabled or when the Chart app is in Tides mode, the standard Current station symbol is replaced with a dynamic Current graphic. Arrows are used to indicate the direction of current flow. The size and color of the arrow indicates the strength of the current:

Yellow square: 0 Knots to 0.1 Knots
Yellow small arrow: 0.2 Knots to 1.0 Knots
Orange small arrow: 1.1 Knots to 2.0 Knots
Orange large arrow: 2.1 Knots to 3.0 Knots
Red large arrow: Greater than 3.0 Knots